METHODS FOR EXTRACTING RARE EARTH ELEMENTS FROM ION-ADSORPTION CLAYS
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United States of America
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Dec 19, 2024
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Aug 26, 2024
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Aug 26, 2024
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Abstract
Methods of extracting rare earth elements (REEs) from low-grade REE sources composed of clayey materials. In one aspect, the REE sources are the waste materials generated in the coal and kaolin clay industries during the courses of upgrading mined coal and kaolinite. The methods described herein include the steps of pre-concentrating REE-bearing minerals using physical separation methods to prepare high-grade feedstocks for the chemical extraction of high-value REEs and critical materials while minimizing both the capital and operating costs.
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